1. Feynman (QED and QCD)
2. Einstein (Relativity)
3. Newton (Gravity & Motion)
4. Boyle (Chemistry)
5. Mendel (Genetics)
That's roughly based on my understanding of most important contributions to a given field, most of which are the initial understanding, though it's probably wrong
Other mentions: Neils Bohr, Galileo, Copernicus, Paul Dirac, Schroedinger, Max Plank, Max Born (yeah, I'm a quantum fiend).
2. Einstein (Relativity)
3. Newton (Gravity & Motion)
4. Boyle (Chemistry)
5. Mendel (Genetics)
That's roughly based on my understanding of most important contributions to a given field, most of which are the initial understanding, though it's probably wrong

Other mentions: Neils Bohr, Galileo, Copernicus, Paul Dirac, Schroedinger, Max Plank, Max Born (yeah, I'm a quantum fiend).
.